Mickey Papa new signature Naturals skateboard wheel by Ricta. The 99a durometer Ricta Naturals feature a classic street style pill-shape. Papa's 51mm pro wheel is engineered to perform equally well in the skate park or the streets. Rock the graphics on the outside or flip the wheel for a clean, non-graphic look. Made with Ricta Wheels NRG Hi-Energy urethane formula, the Naturals are proven by top pros to be the fastest non-core skateboard wheel.